Move //sky/compositor to //sky/viewer/compositor

sky/compositor/surface_allocator.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_
-#define SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_
-
-#include "base/basictypes.h"
-#include "mojo/services/surfaces/public/interfaces/surface_id.mojom.h"
-
-namespace sky {
-
-class SurfaceAllocator {
- public:
-  SurfaceAllocator(uint32_t id_namespace);
-  ~SurfaceAllocator();
-
-  mojo::SurfaceIdPtr CreateSurfaceId();
-
- private:
-  uint32_t id_namespace_;
-  uint32_t next_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(SurfaceAllocator);
-};
-
-}  // namespace sky
-
-#endif  // SKY_COMPOSITOR_SURFACE_ALLOCATOR_H_